Animal classification

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Across
  1. 5. hollow sac like animals
  2. 7. Nematoda
  3. 8. milk nourishing animals
  4. 10. excretory organ of annelida
  5. 14. lizards and snakes
  6. 15. animals without backbone
  7. 16. spiders , ticks .Scorpion
Down
  1. 1. spiny skinned animals
  2. 2. animals with jointed legs.
  3. 3. body covered with feathers
  4. 4. flatworms
  5. 6. pore bearing animals
  6. 9. soft bodied shelled animals
  7. 11. live on land and water
  8. 12. animals with backbones
  9. 13. animals